Pen



FIG. 1 is a perspective view of a pen showing my new design;

FIG. 2 is a front elevational view of the pen of FIG. 1;

FIG. 3 is a rear elevational view of the pen of FIG. 1;

FIG. 4 is a left side elevational view of the pen of FIG. 1;

FIG. 5 is a right side elevational view of the pen of FIG. 1;

FIG. 6 is a top plan view of the pen of FIG. 1; and,

FIG. 7 is a bottom plan view of the pen of FIG. 1.

The broken lines in the drawings are included for the purpose of showing portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 